I really enjoy using the Logitech Optical Wireless Mouse at work, home and school. I have several of them and they are very durable and reliable. I very seldom have to change out the battery as they have a great battery life. I love having the flexibility of removing the USB and connecting to a new device very quickly. There is no delay from the mouse to the screen while using and it is extremely easy to install to my devices. I love the different colors and styles that are available. Everyone in my family has their own according to their personalities. At such an affordable price, this is a great buy and I would recommend this brand mouse to anyone. Performance Works with great accuracy. I have not had any problems with mine. Durability Very durably built and connects quickly to new devices. Design Many colors and designs to chose from to fit your style. Comfort Very comfortable to use, does not cause any discomfort in my hand or fingers.